The precise chemical composition of these very alien lakes and seas remained unknown until 2014, when Cassini's radar instrument detected Ligeia Mare, now known to be Titan's second-largest hydrocarbon-filled lake. Ligeia Mare is brimming with an abundance of sloshing methane, and this enormous liquid reservoir is approximately the same size as two of Earth's Great Lakes combined--Lake Michigan and Lake Huron. Many planetary scientists think that the seabed of Ligeia Mare may be blanketed with a thick layer of sludge that is composed of organic-rich compounds.

I have talked to MIT and Harvard grads who still think that if a rocket whizzes by you in space it makes a whooshing sound much like a jet craft does in the atmosphere. Someone forgot to tell them there is no sound where there is no air. So what, you say?

The nitrogen that exists in Titan's atmosphere indicates that it likely formed early in our Solar System's 4.56 billion-year-old history. This means that Titan probably was born within the same cold disk of gas and dust that gave birth to our Sun (protostellar nebula), instead of forming in the warmer disk that eventually created Saturn.